Your body is not symmetrical on the inside — and the direction you sleep changes how gravity acts on every major system while you are unconscious. Tonight, when you lie flat on your back, seventy grams of tongue muscle begin falling backward toward your airway. Your stomach acid shifts level with t
35:15
28:35
22:31
15:35
48:52
29:17
39:59
34:57
19:24
28:25
20:33
29:20
27:46
20:35
26:28
51:48
31:19
22:36
20:11
10:39